Enantioseparation of racemic N-acylarylalkylamines on various amino alcohol derived tau-acidic chiral stationary phases

Synthesis and application of N-3,5-dinitrobenzoyl and C3 symmetric diastereomeric chiral stationary phases

Three diastereomeric chiral compounds, namely, (R,R)-(+)-2-amino-1,2-diphenylethanol, (1S,2R)-(+)-2-amino-1,2-diphenylethanol, and (1R,2R)-(+)-1,2-diphenylethylenediamine were used as starting materials for preparing three N-3,5-dinitrobenzoyl derivative chiral stationary phases (CSPs) (CSP 1, 2, and 3) and three C₃ symmetric CSPs (CSP 4, 5, and 6). The six newly prepared CSPs were applied to the chiral separation of 44 chiral samples by HPLC. Most samples were isolated on CSP 6, with the highest average separation factor among the six newly prepared CSPs.

Chiral separation on various modified amino alcohol-derived HPLC chiral stationary phases

3,5-Dinitrobenzoyl chloride was previously used for the preparation of (R)-phenylglycinol- and (S)-leucinol-derived chiral stationary phases. In this study, 3,5-bis(trifluoromethyl)benzoyl chloride, 2-furoyl chloride, 2-theonyl chloride, 10,11-dihydro-5H-dibenzo[b,f]azepine-5-carbonyl chloride, diphenylcarbamoyl chloride, and 1-adamantanecarbonyl chloride were used to prepare six new phenylglycinol-derived chiral stationary phases (CSPs) and five new leucinol-derived CSPs. Using these 11 CSPs, chiral separation of nine π-acidic amino acid derivatives and five π-basic compounds was performed, and the separation results were compared. An adamantyl-derived CSP showed good separation.

Synthesis of a New Chiral Selector Base on Pracoterol for Chiral Stationary Phase

According to the chiral resolution mechanism and structures of Pirkle’s chiral stationary phase (CSP), a new amide chiral selector base on pracoterol has been prepared in this thesis. In order to get a better yield, all the conditions and purification conditions of the reactions were investigated, and the key products were characterized by HPLC, FT-IR and 1H NMR. This chiral selector may be developed as chiral selector of CSP.

Enantioseparation of tiropramide by HPLC

Tiropramide is an antispasmodic drug that has a chiral center. Resolution of tiropramide enantiomers on various kinds of chiral stationary phases was performed by HPLC. A good resolution on a leucine-derived chiral stationary phase was found. An improved chromatographic condition to resolve racemic tiropramide on the CSP was examined by changing the flow rate, composition, and kind of mobile phases.